If you have a product key and just need the installation files:
Microsoft does not offer a free version of Office 2010 today, as the product reached its end of support on October 13, 2020. ⚠️ Important Considerations
Unsupported software no longer receives security updates, leaving your system vulnerable.
Since downloading Office 2010 for free is no longer possible through official channels, consider these safer, free options: 1. Microsoft 365 for the Web